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'~,' CORE LABORATORIES <br />Western Atles <br />International <br />..,. ~,.,~ «ma . <br />Sample Delivery Group Narrative <br />Customer: Battle Mountain Gold <br />Project: San Luis Mine <br />Core Labs Project Numbers: 930214/930263 (reanalysis: 930406) <br />On February 9th and 19th, 1993, Core Laboratories-Aurmra received <br />sample sets from Battle Mountain Gold's San Luis Mine that were to <br />be analyzed for a variety of inorganic parameters and <br />radionuclides. The samples were collected by a representative of <br />Battle Mountain Gold on 02/03 and 02/18. On March 16, 1993, Alana <br />Scott of Battle Mountain Gold requested that Core Labs investigate <br />results for total cyanide and Weak Acid Dissociable (WAD) cyanide <br />generated on several of the samples. It was decided to perform <br />reanalyses of these particular samples and the results are <br />attached (Core Job Number 930406). <br />The following information is pertinent to the interpretation of <br />these data pacY.ages. <br />The results of the reanalyses for total and WAD cyanide are in <br />many cases significantly different than the results obtained <br />during the original analyses of these samples. It should be noted <br />that all reanalyses were performed past the publis ed holding <br />times for these parameters. Although WAD cyan de results <br />theoretically should not be greater than total Cyanlide results <br />this situation existed for several of the original anr~alyses. In <br />all cases except one this situation did not exist witk~ results of <br />the reanalyses. The raw data for both the original dnalyses and <br />reanalyses was thoroughly reviewed and all qualyty control <br />associated with both sets of data met requirementes. Qore Labs is <br />unable to adequately explain the anomoly associated with these <br />results at this time. <br />David A. McL4harter <br />Laboratory Manager <br /> <br />